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Idle time for the turbo to cool down

How long do I need to idle before I shut off the engine? In the booklet that came with the truck says to high idle to cool down the turbo but doesn't say how long. I know some you let the truck idle for 15 minutes and others as short as 3. Just over 1500 miles and I've already used half a gallon of oil. Over all, I like this truck.

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This is Cummins recommendation right from their site.

Shut Down

Before shutting your engine down, let the turbocharger cool down. When an engine runs at maximum power/high torque, the turbocharger is operating at very high temperatures and speeds. Hot shut down can cause reduced service life which is avoidable by a minute or two of idling. Most mobile equipment applications include an adequate cooling period during parking or mooring procedures. Allow your engine to idle for 1-5 minutes to allow the high temperatures and speed to reduce and so prolong the life of your turbocharger.

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You can also consider the time you are idling around the parking lot trying to find a place to park in this time too but 3-5 minutes is a good rule of thumb. Drivers that roll off the highway and shut the engine down cause the turbo to actually fry the oil around the impeller shaft which will cause carbon build up over time and eventually effect oil flow through the turbo.

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Thanx. I usually let the truck idle for at least a few minutes before shutting down but wanted to be sure.

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John will be eternally grateful.
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